hwmon: do not init sensors on startup

The U-Boot Design Principles[1] clearly say:

  Initialize devices only when they are needed within U-Boot, i.e. don't
  initialize the Ethernet interface(s) unless U-Boot performs a download
  over Ethernet; don't initialize any IDE or USB devices unless U-Boot
  actually tries to load files from these, etc. (and don't forget to
  shut down these devices after using them - otherwise nasty things may
  happen when you try to boot your OS).

So, do not initialize and read the sensors on startup.

Signed-off-by: Heiko Schocher <hs@denx.de>
cc: Wolfgang Denk <wd@denx.de>
cc: Holger Brunck <holger.brunck@keymile.com>
diff --git a/include/dtt.h b/include/dtt.h
index 399b64a..9e6c08c 100644
--- a/include/dtt.h
+++ b/include/dtt.h
@@ -52,7 +52,7 @@
 #endif
 #endif /* CONFIG_DTT_ADM1021 */
 
-extern int dtt_init (void);
+extern int dtt_init_one(int);
 extern int dtt_read(int sensor, int reg);
 extern int dtt_write(int sensor, int reg, int val);
 extern int dtt_get_temp(int sensor);